Guo, YuanbinZhang, Jianzhong (Charlie)McCain, DennisCavallaro, Joseph R.2007-10-312007-10-312004-11-012004-11-01Y. Guo, J. (. Zhang, D. McCain and J. R. Cavallaro, "Efficient MIMO equalization for downlink multi-code CDMA: complexity optimization and comparative study," vol. 4, no. 7, 2004.https://hdl.handle.net/1911/19928Conference PaperIn this paper, we present an efficient LMMSE chip equalizer to suppress the interference caused by the multipath fading channel in the MIMO multi-code CDMA downlink. The block-Toeplitz structure in the correlation matrix is approximated with a block circulant matrix. An FFT-based algorithm is applied to avoid the Direct-Matrix-Inverse (DMI) in the system equation. Hermitian optimization is proposed to further reduce the complexity. A comparative study in both performance and complexity with the Conjugate-Gradient (CG) algorithm is then presented. The simulation shows very promising results for the FFT-based equalizer compared with both the DMI and CG algorithms.engMIMO equalizerMulti-code CDMAcomplexityConference paperMIMO equalizerMulti-code CDMAcomplexityhttp://dx.doi.org/10.1109/GLOCOM.2004.1378459